condition mean min max ZT0-3 11.464345000000002 11.464345000000002 11.464345000000002 ZT4-7 6.854625 6.854625 6.854625 ZT8-11 7.251469999999999 7.251469999999999 7.251469999999999 ZT12-15 7.521485 7.521485 7.521485 ZT16-19 8.995375 8.995375 8.995375 ZT20-23 15.242125 15.242125 15.242125